Originally Posted by
geezer101
I'm thinking the naphthalene is doing something sneaky like acting as an anti-knock agent if there is significant loss of compression due to frozen rings. Adding something that will dissolve carbon and laminated oil could blow pass the rings and possibly affect air/fuel burn while the process is taking place. In all honesty, 5-15 minutes of low rpm run time is nowhere near enough to allow for rings and hydraulics to regain full actuation. I've done my oil flush on a few older/higher mileage engines with good results.
I also did it for an elderly couple that had a 2014 model Corolla that they were killing with kindness. 2 or 3 weekly short trips and sitting at idle and waaay lower mileage than a car of it's age should have accumulated. When I pulled the filter it was coked up badly so I did the flush blend and took it for a solid hour run uphill and back along the coast. It ran like a pig. No power, felt like the VVT wasn't actuating properly, a little valvetrain noise. Just over half an hour into the run it found it's mojo. When I got onto the oil change I was surprised at how much cleaner the old filter was after removing it. Used a full synthetic oil, ran like a champ. And then the old guy totalled it 2 weeks later lol.
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